Improvement in mechanism for operating sewing-machines



UNITED STATES PATENT ()rrrcn ELISHA SHIVER, OF WASHINGTON, DISTRICT OFCOLUMBIA, ASSIGNOR TO HIMSELF AND J. H. MOBLAIR, OF SAME PLACE.

IMPROVEMENT IN MECHANISM FORDPERATING SEWING-MACHINES.

Specification forming part of Letters Patent No. 100,934i, dated March15, 1870.

To all whom it may concern:

Be it known that I, ELISHA SHIVER, of Washington, in the District ofColumbia, have invented a new and useful Improvement in Motors forSewing-Machines; and I do here by declare that the following is a full,clear, and exact description thereof, reference being bad to the annexeddrawings, making part of this specification, in which- Figure 1 is aside elevation, showing the table to which the motor is attached, theframe of such motor, the balancewheel, and the brake which acts upon thesame. Fig. 2 is a plan view of the motor, showing the arrangement of theprincipal parts thereof; and Fig. 3 is an inverted sectional elevation,showing the devices for preventing the breaking of the spring in windingup the same.

Corresponding letters refer to corresponding parts in the severalfigures.

This invention relates to motors for driving sewing-machines; and itconsists in the construction, combination, and arrangement of the partsthereof, as will be more fully described hereinafter.

I am aware that motors for the purpose to which this is to be appliedhave heretofore been used, consisting of a spring for giving motion tothe parts, and a train of wheels for communicating such motion to thesewingmachine; but such devices have never, to my knowledge, beensupplied with the means for preventing the spring from being broken bybeing wound up too far; neither have they been supplied with anadjustable fly or fan for regulating the motion of the machine, arrangedas in the present one; nor yet with brakes arranged as these are forcontrolling the movements of the device while in operation.

The object of the present invention is to provide the means foraccomplishing the aboveindicated results.

A in the drawings refers to a table, to the under side of which themotor is to be attached. A A refer to the sides of the frame, whichconsists of two plates of metal which are held in position by rods whichpass from one to the other, as shown in Fig. 2. These plates form thebearings for the ends of the shafts to which the gear-wheels aresecured.

B refers to a case which incloses a spring for giving motion to theparts of the motor.

This spring is attached to the case and to the shaft B in the usualmanner. B refers to the shaft which carries the spring-case B, gearwheelD, ratchet-wheel D, and cam G.

0 refers to a cam which is arranged upon the shaft B in such a manner asto engage with the wheel 0, which revolves upon a stud which is securedto the side of frame A, as shown in Fig. 2. This wheel or disk has slotscut in its periphery, asshown in Fig. 3,

there being any required number of such slots to determine the number ofrevolutions which may be given to the shaft which is attached to theinner end of the coiled spring, so that when such spring is wound up tothe proper point the cam shall come in contact with the solid surface ofthe disk 0, and thus prevent the further winding of the spring, and thusall danger of breakage is avoided.

D refers to the gear-wheel, which is made fast to the shaft B, andcommunicates its motion to the other wheels of the train. D refers to anordinary ratchet-wheel, which is supplied with a'dog or ratchet, whichlast is held in position by means of a spring in the usual manner.

E, E and E refer to a train of gear-wheels which communicate motion tothe shaft F, upon which the balance-wheel and the fly or fan are placed.

F F refer to a fan or fly which is composed of two sheets of metal,which are secured to the outer ends of a shaft or rod which passesthrough the shaft F, it being so fitted therein as to be capable ofturning, so that the fans may be set in such a manner as to present anyportion of their surface to the resistance of the atmosphere as they arebeing revolved with the shaft F, or they may be so turned as to presentonly their edges for such resistance, the object be'ing to afford onemeans of regulating the movement of the motor.

F is the shaft, above alluded to, which passes through the sides of theframe, as shown in Fig. 2, and carries the fly or fan, the pinion E andbalance-wheel G, which is upon the outer end thereof, but within theyoke which forms the bearing for this end of the shaft.

G refers to a balance-wheel, which is intended to regulate the movementsof all the rest of the wheels in the train, it being placed upon theshaft which runs at the greatest velocity, by which means its effect isgreatly increased over what it would be if placed upon anyslower-revolving shaft.

H refers to a handle of a brake, which rests upon the upper surface ofthe table A when the brake is not in operation, but which enters arecess formed in such a table when the brake is to be applied, as shownin Fig. 1, the rod which extends from it to the spring H controlling themovements of suchbrake, which may be used to stop the movement of themachine, at any time when it may be desirable to do so, by permittingthe parts to assume the position shown in Fig. 1.

I I are to represent the treadle of a sewingmachine, which receives itsmotion from the motor through the eccentric I and eccentricrod I 1refers to a pulley which drives the sewing-machine by means of a beltwhen the treadle is dispensed with, it being in this instance placedupon the shaft which receives its motion from the wheel which is uponthe shaft to which the spring is connected.

K refers to a rod which is made to embrace at one of its ends one of theshafts of the motor, and has upon its other end a nut which rests uponthe table, so that as it is screwed down upon such table it may be madeto afford any required amount of resistance to the movements of suchmotor.

Having thus described my invention. what I claim, and desire to secureby Letters Patent, is-

1. The construction of the wheel'or disk G, substantially as and for thepurpose specified.

2. The combination of the wheel or disk 0, cam O, shaft B, and springwith whichthe motor is driven, substantially as and for the purposespecified.

3. The arrangement of the fly or fan F F and the rod or shaft on whichit is placed with reference to the shaft F, substantially as and for thepurpose set forth.

4. The arrangement of the rod K and its nut with reference to theshaftaround which it passes, substantially as and for the purpose setforth.

in testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

v E. SHIVER.

Witnesses:

A. RUPERT, B. EDW. J. ErLs.

